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<h2><a name="signjar">SignJar</a></h2>
<h3>Description</h3>
<p>Signing a jar allows users to authenticate the publisher.</p>
<p>Signs JAR files with the <a target="_blank" href="http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jarsigner.html"><tt>jarsigner</tt> command line tool</a>. 
It will take a named file in the <tt>jar</tt> attribute, and an optional
<tt>destDir</tt> or <tt>signedJar</tt> attribute. Nested paths are also
supported; here only an (optional) <tt>destDir</tt> is allowed. If a destination
directory or explicit JAR file name is not provided, JARs are signed in place.
</p>
<p>
Dependency rules
</p>
<ul>
<li>Nonexistent destination JARs are created/signed</li>
<li>Out of date destination JARs are created/signed</li>
<li>If a destination file and a source file are the same,
and <tt>lazy</tt> is true, the JAR is only signed if it does not 
contain a signature by this alias.</li>
<li>If a destination file and a source file are the same,
and <tt>lazy</tt> is false, the JAR is signed.</li> 
</ul>

<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">jar</td>
    <td valign="top">the jar file to sign</td>
    <td valign="top" align="center">Yes, unless nested paths have
      been used.</td>
  </tr>
  <tr>
    <td valign="top">alias</td>
    <td valign="top">the alias to sign under</td>
    <td valign="top" align="center">Yes.</td>
  </tr>
  <tr>
    <td valign="top">storepass</td>
    <td valign="top">password for keystore integrity.</td>
    <td valign="top" align="center">Yes.</td>
  </tr>
  <tr>
    <td valign="top">keystore</td>
    <td valign="top">keystore location</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">storetype</td>
    <td valign="top">keystore type</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">keypass</td>
    <td valign="top">password for private key (if different)</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">sigfile</td>
    <td valign="top">name of .SF/.DSA file</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">signedjar</td>
    <td valign="top">name of signed JAR file. This can only be set when 
    the <tt>jar</tt> attribute is set.</td>
    <td valign="top" align="center">No.</td>
  </tr>
  <tr>
    <td valign="top">verbose</td>
    <td valign="top">(true | false) verbose output when signing</td>
    <td valign="top" align="center">No; default false</td>
  </tr>
  <tr>
    <td valign="top">strict</td>
    <td valign="top">(true | false) strict checking when signing.<br/><em>since Ant 1.9.1</em>.</td>
    <td valign="top" align="center">No; default false</td>
  </tr>
  <tr>
    <td valign="top">internalsf</td>
    <td valign="top">(true | false) include the .SF file inside the signature
block</td>
    <td valign="top" align="center">No; default false</td>
  </tr>
  <tr>
    <td valign="top">sectionsonly</td>
    <td valign="top">(true | false) don't compute hash of entire manifest</td>
    <td valign="top" align="center">No; default false</td>
  </tr>
  <tr>
    <td valign="top">lazy</td>
    <td valign="top">flag to control whether the presence of a signature
  file means a JAR is signed. This is only used when the target JAR matches
  the source JAR</td>
    <td valign="top" align="center">No; default false</td>
  </tr>
  <tr>
    <td valign="top">maxmemory</td>
    <td valign="top">Specifies the maximum memory the jarsigner VM will use. Specified in the
                     style of standard java memory specs (e.g. 128m = 128 MBytes)</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">preservelastmodified</td>
    <td valign="top">Give the signed files the same last modified
      time as the original jar files.</td>
    <td valign="top" align="center">No; default false.</td>
  </tr>
  <tr>
    <td valign="top">tsaurl</td>
    <td valign="top">URL for a timestamp authority for timestamped
    JAR files in Java1.5+</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">tsacert</td>
    <td valign="top">alias in the keystore for a timestamp authority for 
    timestamped JAR files in Java1.5+</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">executable</td>
    <td valign="top">Specify a particular <code>jarsigner</code> executable
      to use in place of the default binary (found in the same JDK as
      Apache Ant is running in).<br/>
      Must support the same command line options as the Sun JDK
      jarsigner command.
      <em>since Ant 1.8.0</em>.</td>
    <td align="center" valign="top">No</td>
  </tr>  
  <tr>
    <td valign="top">force</td>
    <td valign="top">Whether to force signing of the jar file even if
      it doesn't seem to be out of date or already signed.
      <em>since Ant 1.8.0</em>.</td>
    <td align="center" valign="top">No; default false</td>
  </tr>  
  <tr>
    <td valign="top">sigalg</td>
    <td valign="top">name of signature algorithm</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">digestalg</td>
    <td valign="top">name of digest algorithm</td>
    <td valign="top" align="center">No</td>
  </tr>
</table>
<h3>Parameters as nested elements</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">path</td>
    <td valign="top">path of JAR files to sign. <em>since Ant 1.7</em></td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">fileset</td>
    <td valign="top">fileset of JAR files to sign. </td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">mapper</td>
    <td valign="top">A mapper to rename jar files during signing</td>
    <td valign="top" align="center">No, and only one can be supplied</td>
  </tr>
  <tr>
    <td valign="top">sysproperty</td>
    <td valign="top">JVM system properties, with the syntax of Ant
    <a href="exec.html#env">environment variables</a> </td>
    <td valign="top" align="center">No, and only one can be supplied</td>
  </tr>
 </table>


<h3>Examples</h3>
<p>For instructions on generating a code signing certificate, see the <a target="_blank" href="http://docs.oracle.com/javase/7/docs/technotes/tools/windows/keytool.html">keytool documentation</a> and/or instructions from your certificate authority.</p>
  <blockquote><pre>
&lt;signjar jar=&quot;${dist}/lib/ant.jar&quot;
alias=&quot;apache-group&quot; storepass=&quot;secret&quot;/&gt;
</pre></blockquote>
<p>
  signs the ant.jar with alias &quot;apache-group&quot; accessing the
  keystore and private key via &quot;secret&quot; password.
</p>
  <blockquote><pre>
&lt;signjar destDir="signed"
    alias="testonly" keystore="testkeystore"
    storepass="apacheant"
    preservelastmodified="true"&gt;
  &lt;path&gt;
    &lt;fileset dir="dist" includes="**/*.jar" /&gt;
  &lt;/path&gt;
  &lt;flattenmapper /&gt;
&lt;/signjar&gt;
</pre></blockquote>
<p>
Sign all JAR files matching the dist/**/*.jar pattern, copying them to the
directory "signed" afterwards. The flatten mapper means that they will
all be copied to this directory, not to subdirectories.

</p>
  <blockquote><pre>
&lt;signjar
    alias="testonly" keystore="testkeystore"
    storepass="apacheant"
    lazy="true"
    &gt;
  &lt;path&gt;
    &lt;fileset dir="dist" includes="**/*.jar" /&gt;
  &lt;/path&gt;
&lt;/signjar&gt;
</pre></blockquote>
<p>
Sign all the JAR files in dist/**/*.jar <i>in-situ</i>. Lazy signing is used,
so the files will only be signed if they are not already signed.
</p>
  <blockquote><pre>
&lt;signjar
    alias="testonly" keystore="testkeystore"
    storepass="apacheant"
    sigalg="MD5withRSA"
    digestalg="SHA1"&gt;
  &lt;path&gt;
    &lt;fileset dir="dist" includes="**/*.jar" /&gt;
  &lt;/path&gt;
&lt;/signjar&gt;
</pre></blockquote>
<p>
Sign all the JAR files in dist/**/*.jar using the digest algorithm SHA1 and the
signature algorithm MD5withRSA. This is especially useful when you want to use
the JDK 7 jarsigner (which uses SHA256 and SHA256withRSA as default) to create
signed jars that will be deployed on platforms not supporting SHA256 and
SHA256withRSA.
</p>
<h3>About timestamp signing</h3>

<p>Timestamps record the date and time that a signature took place, allowing the signature to be verified as of that point in time.
With trusted timestamping, users can verify that signing occurred before a certificate's expiration or revocation. Without this timestamp, users can only verify the signature as of their current date.</p>

<p>
Timestamped JAR files were introduced in Java1.5 and supported in Ant since
Ant 1.7. Ant does not yet support proxy setup for this signing process. 
</p>

<p>Common public timestamp authorities include
  <ul>
    <li>http://timestamp.verisign.com</li>
	<li>http://tsa.starfieldtech.com</li>
	<li>https://timestamp.geotrust.com/tsa</li>
	<li>Others (see your certificate authority)</li>
  </ul></p>

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